I check Intel Slava almost every day and if there were official US troops in Ukraine, they would post it there.
There are former US mil mercenaries, have been some US advisors and trainers, and rumors of some US military in small numbers here and there.
I think the info that regular US troops are on the ground is likely not factual.
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Agreed.
Now CIA ... that's another matter. Ukraine is doubtless still an intelligence agency playground.